Device for removing carbon from piston-ring grooves



July 21, 1925. 1,546,786

G. H. JULIAN DEVICE FOR REMOVING CARBON FROM PISTON RING GROOVES Filed Aug. 12. 1924 Patented July 21, 1925.

UNITED STATES GEORGE H. JULIAN, 013 BOSTON, MASSACHUSETTS.

DEVICE FOR REMOVING CARBON FROM PISTON-BING GROOVES.

Application filed August 12, 1924. Serial No. 731,568.

To all whom it may concern:

Be it known that I, GEORGE H. JULIAN, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Devices for Be moving Carbon from Piston-Ring Grooves, of which the following is a specification.

The invention to be hereinafter described relates to devices for removing carbon from piston ring grooves.

The aim and purpose of the present invention is to provide a simple, efficient tool whereby carbon can be quickly and easily removed from piston ring grooves.

The character of the invention may be best understood by reference to the follow ing description of one good form thereof shown in the accompanying drawing wherein:

Figure 1 is a perspective view of the device for removing carbon from piston ring grooves, and

Fig. 2 is a longitudinal section through the device shown in Fig. 1.

Referring to the drawing, the carbon removing device shown therein as one embodiment of the invention comprises a handle desirable in the form of a tube 1 of substantial length. Adjacent one end of this tube is an arm 3 having a web 5 and a flange 7 formed to present a shoulder 9 at the end of the tube. 1

This handle may be provided with means adapted to embrace pistons of different sizes and carry a tool for scraping the carbon from the piston grooves. This means in the present instance of the invention comprises a member 11 preferably curved and of a rigid character. One end of this memher is pivotall mounted on a bolt 13 on the arm 3. aid member has a boss or holder 15 projecting outward therefrom and in said holder is a carbon removing tool 17, secured in position by aset screw 19. This tool has active ends 21 and 23 of different widths and interchangeable so that the same tool may be employed for removing carbon from piston grooves of different widths.

Connected to an end of the member 11 is a flexible member in the present instance of the invention in the form of a ribbon 25 of resilient steel and preferably wider than the width of the piston grooves. This ribbon is curved and passes over the shoulder 9 referred to and thence downward into the operator of the device. The toothed bar has teeth 33which are inclined with respect to the longitudinal axis of the bar and any one of these teeth is adapted to engage a holding element, in'the present instance in the form of a pin 35 within and secured to the handle.

In use the toothed bar may be thrust inwardly to expand the ribbon sufficiently to enable the embracing means formed by the member 11 and ribbon to be inserted readily over the end of a piston. Then the device may be adjusted to bring the carbon remov ing tool 17 to one of the grooves of the piston. Thereupon the operator grasps the ring 81 and pulls the same outward until the ribbon is brought into intimate embrac ing engagement with the piston. In the course of this movement the ribbon wipes and bears against the shoulder 9 referred to. The toothed bar is pulled outward sufficiently to place the coil spring 27 under tension. Then the toothed bar is shifted laterally somewhat so that one of its teeth will engage the pin 35. The tension of the coil spring 27 will serve to'hold the tooth against the pin and prevent inadvertent release of the bar, and also, the tension of the spring will serve to maintain the ribbon in proper engagement with the piston.

Then the handle 1 is grasped and given a rotary movement to cause the carbon removing tool to travel around the piston groove and clear the carbon therefrom.

To release the device from the piston, the ring 31 is grasped by the operator and pulled outward slightly. The incline of the teeth of the bar is such that the tooth in front of the pin 35 will shift the bar out of line with the pin when the bar is pulled outward slightly. Then the bar may be moved inward with the assistance of the coil spring 27, and this will allow the ribbon to construction, efiicient in operation, and quickly and easil adjusted to pistons of difterent diameters.

It will be understood that the invention is not limited to the specific embodiment shown and that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

What is claimed is:

1. A device for removing carbon from piston ring grooves comprising, in combination, a hollow handle having an arm projecting therefrom, a member pivotall con nected to said arm, a holder on said memher, a carbon removing tool mounted in said holder, a flexible ribbon connected to said member and having portion extending into the hollow handle, a toothed bar in the handle, a coil spring connecting the ribbon and bar, and an element in the handle for interlocking engagement with any one of the teeth of the bar.

2. A device for removing carbon from piston ring grooves comprising, in combina tion, a hollow handle, a curved rigid member pivotally connected thereto, a carbon removing tool carried by said member, a flexible member connected to the curved member and having a portion extending into the hollow handle and means connected to said flexible member for drawing the same into the handle to adjust said members to pistons of different diameters, and means cooperating with the handle for securing the flexible member in its positions o1 adjustment.

3. A device for removing carbon from piston ring grooves comprising, in combination, a hollow handle, means at one end of said handle :tor embracing a piston, a carbon removing tool carried by said embracing means, the latter having a portion extending into the hollow handle, a toothed bar in the handle, a coil spring connecting the toothed bar with the embracing means, said toothed bar being adjustable longitudinally of the handle to adjust the embracing means to pistons ott dillj'ercnt diameters, and an element on the handle adapted to be engaged by one or another of the teeth of the bar to hold the same in its positions of adjust ment.

, GEORGE H. JULIAN. 

